#!/usr/bin/env ruby

require 'rubygems'

$LOAD_PATH.unshift(File.dirname(__FILE__) + "/../lib")

USAGE = "USAGE: " + File.basename(__FILE__) + " <file> <object id> [generation]"

require 'pdf/reader'

filename, id, gen = *ARGV

if filename.nil? || id.nil?
  puts USAGE
  exit 1
elsif !File.file?(filename)
  $stderr.puts "#{filename} does not exist"
  exit 1
end

# tweak the users options
id  =  id.to_i
gen ||= 0
gen = gen.to_i

# make magic happen
begin
  obj = PDF::Reader.object_file(filename, id, gen)

  case obj
  when Hash, Array
    puts obj.inspect
  when PDF::Reader::Stream
    puts obj.hash.inspect
    puts obj.unfiltered_data
  else
    puts obj
  end
rescue PDF::Reader::InvalidObjectError
  $stderr.puts "Error retreiving object #{id}, gen #{gen}. Does it exist?"
  exit 1
rescue PDF::Reader::MalformedPDFError => e
  $stderr.puts "Malformed PDF file: #{e.message}"
  exit 1
rescue PDF::Reader::UnsupportedFeatureError => e
  $stderr.puts "PDF file implements a feature unsupported by PDF::Reader: #{e.message}"
  exit 1
end